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    <script>
        // ES6允许给函数参数赋初始值
        // 1.形参初始值，具有默认值的参数，一般位置要靠后(潜规则)
        function add(a, b, c=10) {
            return a + b + c;
        }
        let result = add(1, 2);
        console.log(result);//10

        // 2.与解构赋值结合使用
        function connect({host='127.0.0.0',userName,password,port}){
            console.log(host);
            console.log(userName);
            console.log(password);
            console.log(port);           
        }
        // 调用
        connect({
            // host:'localhost',
            userName:'root',
            password:'root',
            port:3306
        })
    </script>
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